JPS60168903A - Hydraulically operating circuit of weight lifting equipment - Google Patents
Hydraulically operating circuit of weight lifting equipmentInfo
- Publication number
- JPS60168903A JPS60168903A JP2001784A JP2001784A JPS60168903A JP S60168903 A JPS60168903 A JP S60168903A JP 2001784 A JP2001784 A JP 2001784A JP 2001784 A JP2001784 A JP 2001784A JP S60168903 A JPS60168903 A JP S60168903A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- main valve
- hydraulic
- cylinder
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/0422—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with manually-operated pilot valves, e.g. joysticks
Abstract
Description
【発明の詳細な説明】
本発明はダンプトラック等の扛重装置の油圧操作回路に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic operating circuit for a hoisting device such as a dump truck.
従来、油圧作動形成の単動式扛重装置のうち作動油量を
大量に必要とする大型の扛重装置においては、パイロッ
ト油圧コントロールによυ主バルブを上昇、下降時共油
圧ポンプの吐出回路にパイロット圧を得るクランキング
圧に設定したチェックバルブを挿入してパイロット圧を
得ていたので、上昇、下降操作時において常に油圧ポン
プを駆動することを要していた。Conventionally, in large-scale hoisting devices that require a large amount of hydraulic oil among single-acting hydraulically operated hoisting devices, pilot hydraulic control is used to raise and lower the main valve using a hydraulic pump discharge circuit. Pilot pressure was obtained by inserting a check valve set to the cranking pressure, which required the hydraulic pump to be constantly driven during ascending and descending operations.
そこで本発明においては扛重装置の上昇時には油圧ポン
プの駆動は本来必要であることより従来と同様の構成作
用とするが、下降時には油圧ポンプによるパイロット圧
を必要とせずに打型シリンダ内に発生する油圧をパイロ
ット圧として利用し主バルブを下降時に操作し、省エネ
ルギーおよび油圧ポンプの寿命延長を図るものである。Therefore, in the present invention, since driving the hydraulic pump is originally necessary when the hoisting device is raised, the structure and function are similar to those of the conventional one, but when the hoisting device is lowered, the pilot pressure generated in the striking cylinder is generated without the need for pilot pressure from the hydraulic pump. This hydraulic pressure is used as pilot pressure to operate the main valve during descent, thereby saving energy and extending the life of the hydraulic pump.
本発明は打電シリンダ１によシ荷台の荷重Ｗを打電上昇
させ、下降時には荷台の自重Ｗにより下降する油圧回路
において、下降時に生じる打電シリンダ１内に生じる油
圧をパイロット圧として作動する主バルブ２を介し打電
シリンダ１内の圧油をタンクに逆送せしめた油圧操作回
路であり、主バルブ２に３ボ一トスプリングセンタ形３
位置切換弁を用いを場合は、ダンプ上昇操作時には油圧
ポンプ７、チェックバルブ９、主バルブ２を介し打電シ
リンダ１の油圧回路を形成せしめ、かつダンプ下降操作
時には打電シリンダ１、主バルブ２、タンク８の油圧回
路を形成せ［７め、主バルブ２の上昇操作用に油圧ポン
プ７の圧油をパイロットパルプ３を介し主バルブ２の上
昇操作用油圧チャンバ５に接続し、下降操作用に打電シ
リンダ１と主バルブ２間の接続部を分岐しパイロットパ
ルプ４を介し主バルブ２の下降操作用油圧チャンバ６に
接続せしめたものであり、あるいは上昇操作用、下降操
作用と２つの主バルブを設けたものにあっては油圧ポン
プ７の圧油をパイロットパルプ３を介し作動する上昇操
作用主パルプ１４の常時開のボートを介し油圧ポンプ７
からタンク８に接続すると＼もに、上昇操作用主パルプ
１４の入力ボート前の油圧回路を分岐しチェックバルブ
１７を介し打電シリンダ１に接続し、かっ打電シリンダ
１とチェックバルブ１７の間から２つの油圧回路を分岐
し、一方の油圧回路をパイロットパルプ４を介し下降操
作用主パルプ１５に接続し、他方の油圧回路を下降操作
用主パルプ１５の常時閉のボートを介しタンク８に接続
したものである。The present invention uses a hydraulic circuit in which the load W on a loading platform is raised by an electric shock cylinder 1, and when it is lowered, it is lowered by the own weight W of the loading platform. This is a hydraulic operation circuit that sends the pressure oil in the power cylinder 1 back to the tank through the main valve 2.
If a position switching valve is used, a hydraulic circuit for the energizing cylinder 1 is formed through the hydraulic pump 7, check valve 9, and main valve 2 when the dump truck is raised, and a hydraulic circuit for the energizing cylinder 1, the main valve 2, and the tank is formed when the dumper is lowered. Form a hydraulic circuit 8 [7th, connect the pressure oil of the hydraulic pump 7 for raising the main valve 2 to the hydraulic chamber 5 for raising the main valve 2 via the pilot pulp 3, and connect it to the hydraulic chamber 5 for lowering the main valve 2. The connection between the cylinder 1 and the main valve 2 is branched and connected to the hydraulic chamber 6 for lowering the main valve 2 via the pilot pulp 4, or the two main valves are connected to the hydraulic chamber 6 for the lowering operation and the lowering operation for the main valve 2. In the case where the hydraulic pump 7 is provided, the pressure oil of the hydraulic pump 7 is supplied to the hydraulic pump 7 via a normally open boat of the main pulp 14 for lifting operation which is operated via the pilot pulp 3.
When connected to the tank 8, the hydraulic circuit in front of the input boat of the main pulp 14 for lifting operation is branched and connected to the electrification cylinder 1 via the check valve 17. Two hydraulic circuits were branched, one hydraulic circuit was connected to the main pulp 15 for descending operation via the pilot pulp 4, and the other hydraulic circuit was connected to the tank 8 via the normally closed boat of the main pulp 15 for descending operation. It is something.
又、図面の実施例はダンプコントロール上昇−中立−下
降のコントロール状態のうち中立状態を示しており、第
１図の主バルブ２はスプールバルブ形式の３ボートスプ
リングセンタ形の切換弁で中立状態時にセンターバイパ
ス接続、ダンプ上昇操作時にはボー）Ａ１Ｐ接続、ダン
プ下降操作時にはボー）Ａ、Ｐ、Ｒ又はボートＡ、Ｒ接
続とし、ボートＰには油圧ポンプ７をチェックバルブ９
を介し接続し、ボートＨにはタンク８を接続し、ボート
Ａには打電シリンダ１を接続している。又、前記油圧ポ
ンプ７とチェックバルブ９の間を分岐しパイロットパル
プ３を介し主バルブ２の上昇操作用油圧チャンバ５に接
続する。さらにボートＡと打電シリンダ１の間を分岐し
パイロットパルプ４を介し下降操作用油圧チャンバ６に
接続している。The embodiment shown in the drawings shows a neutral state among the control states of dump control up, neutral and down, and the main valve 2 in Fig. 1 is a 3-boat spring center type switching valve in the form of a spool valve. Center bypass connection, baud) A1P connection when raising the dumper, baud) A, P, R or boat A, R connection when lowering the dumper, hydraulic pump 7 for boat P and check valve 9
The tank 8 is connected to the boat H, and the power cylinder 1 is connected to the boat A. Further, it is branched between the hydraulic pump 7 and the check valve 9 and connected to the hydraulic chamber 5 for lifting operation of the main valve 2 via the pilot pulp 3. Further, it branches between the boat A and the power cylinder 1 and is connected to a hydraulic chamber 6 for lowering operation via a pilot pulp 4.
第２図は２個のポペットパルプによる油圧回路の例を示
すもので４．ｊ、１６は油圧ポンプ７の圧油をパイロッ
トパルプ３への分岐点とし、上昇操作用主パルプ１４の
常時開のボートの間に設けたチェックバルブである。又
牙１図、第２図１０．１１は上昇操作用油圧チャンバ５
、下降操作用油圧チャンバ６を所定のクランキング圧に
調整するためのチョーク弁であり、１２はダンプ上昇操
作用の油圧回路の閉塞時の閉じ込み油圧を逃すためのリ
リーフバルブであり、１３はアンロードボートであｆｉ
、１９．２０．２１は各バルブに設けられているリター
ンスプリングであり、Ｗは荷台の荷重量であり、νは荷
台の自重量である。Figure 2 shows an example of a hydraulic circuit using two poppet pulps. j, 16 is a check valve provided between the normally open boat of the main pulp 14 for lifting operation, which serves as a branch point for the pressure oil of the hydraulic pump 7 to the pilot pulp 3; Also, Fig. 1 and Fig. 2 10.11 show the hydraulic chamber 5 for lifting operation.
, a choke valve for adjusting the lowering operation hydraulic chamber 6 to a predetermined cranking pressure, 12 a relief valve for releasing the trapped hydraulic pressure when the hydraulic circuit for the dump lifting operation is blocked, and 13 fi on unloading boat
, 19, 20, and 21 are return springs provided in each valve, W is the load amount of the loading platform, and ν is the own weight of the loading platform.
第３．４図は、牙１．２図中の２方向パイロツトバルブ
３．４を３方向パイロツトバルブ３′、４′におきかえ
た時の参考実施例である。Fig. 3.4 shows a reference embodiment in which the two-way pilot valve 3.4 in Fig. 1.2 is replaced with three-way pilot valves 3' and 4'.
次に第１図の主バルブ２が中立位置において油圧ポンプ
７を図示しない動力源により駆動して圧油を吐出し、チ
ェックバルブ９によリ一定の油圧を生じパイロットバル
ブ３に供給する。Next, when the main valve 2 in FIG. 1 is in a neutral position, the hydraulic pump 7 is driven by a power source (not shown) to discharge pressure oil, and the check valve 9 generates a constant hydraulic pressure and supplies it to the pilot valve 3.
又、チェックパルプ９を通過した圧油は主バルブのボー
トＰ１ボー）Ｒを経てタンク８に戻υ打電シリンダ１に
は圧油は一切供給されない。Further, the pressure oil that has passed through the check pulp 9 is returned to the tank 8 via the main valve boat P1 (Bo)R, and no pressure oil is supplied to the υ striking cylinder 1.
そして、図示しない′電気制御回路によりパイロットバ
ルブ３が作動した時、前記油圧は主バルブ２の上昇操作
用油圧チャンバ５に供給され上昇操作用油圧チャンバ５
が対向するリターンスプリング１９の抗力を越す作動力
を発生し、主バルブ２は中立状態よシボートＡ、ポート
Ｐ接続となり、チェックバルブ９を出た圧油は打型シリ
ンダ１に流れ込み打型シリンダ１を伸長させ荷台の打電
を行う。なお、打電時にはパイロットパルプ４は閉状態
となっているため低圧回路側への逆流は阻止されるので
、伸長している打型シリンダ１は現状のま＼で保持され
下降することは々い。又、前記上昇操作用油圧チャンバ
５に供給された圧油はチョークパルプｌＯを通してタン
ク８に戻る。このとき圧油がチョークパルプ１０を通過
する時の流量は上昇性能に大きな影響がないような値と
している。When the pilot valve 3 is operated by an electric control circuit (not shown), the hydraulic pressure is supplied to the lifting operation hydraulic chamber 5 of the main valve 2.
generates an operating force that exceeds the resistance of the opposing return spring 19, the main valve 2 is in a neutral state, and the port A and port P are connected, and the pressure oil that comes out of the check valve 9 flows into the striking cylinder 1. Extend and power up the loading platform. In addition, since the pilot pulp 4 is in a closed state at the time of power striking, backflow to the low voltage circuit side is prevented, so the extending striking cylinder 1 is held in its current state and is unlikely to descend. Further, the pressure oil supplied to the lifting operation hydraulic chamber 5 returns to the tank 8 through the choke pulp lO. At this time, the flow rate when the pressure oil passes through the choke pulp 10 is set to a value that does not significantly affect the lifting performance.
又、上昇が完了する時にアンロードボート１３が開き圧
油がタンク８に戻る。Further, when the ascent is completed, the unload boat 13 opens and the pressure oil returns to the tank 8.
次に、上昇した荷台を下降させるときはパイロットバル
ブ３のソレノイドへの通電を止めるとリターンスプリン
グ１９０力によシ主パルプ２は中立位置に戻る。そして
、パイロットバルブ４のソレノイドへ図示しない電気制
御回路にょシパイロットバルブ４を作動させる。すると
打型シリンダ１内の油は荷台重量及びあるいは荷重によ
り一定の油圧を生じているためパイロットバルブ４を通
シ下降操作用油圧チャンバ６に供給され、下降操作用油
圧チャンバ６に対向するリターンスプリング加の抗力を
越す作動力を発生し主バルブ２は中立状態を脱しボート
Ａ、Ｐ、Ｒ接続となり、打型シリンダ１を出た圧油はタ
ンク８に逆送せしめられる。Next, when lowering the raised loading platform, when the energization to the solenoid of the pilot valve 3 is stopped, the main pulp 2 returns to the neutral position by the force of the return spring 190. Then, the solenoid of the pilot valve 4 is operated by an electric control circuit (not shown). Then, since the oil in the striking cylinder 1 has a constant hydraulic pressure due to the weight of the platform and/or the load, it is supplied to the hydraulic chamber 6 for lowering operation through the pilot valve 4, and the return spring opposite to the hydraulic chamber 6 for lowering operation is supplied. An operating force exceeding the added drag force is generated, and the main valve 2 leaves the neutral state and becomes connected to boats A, P, and R, and the pressurized oil that has exited the striking cylinder 1 is sent back to the tank 8.
なお、チョーク弁１１は上昇操作時に用いるチョーク弁
１０と同様の作用をする。又、ノくイロットバルプ３が
作動してないことより回路内に閉じ込められる圧油はリ
リーフノくルプ１２によυタンク８に流出せしめられて
いる。Note that the choke valve 11 functions similarly to the choke valve 10 used during the lifting operation. Further, since the nozzle valve 3 is not operating, the pressure oil trapped in the circuit is forced to flow out to the υ tank 8 by the relief nozzle 12.
荷台の下降が完了し打型シリンダ１内の圧油が−無くな
ったらパイロットノ（ルプ４のソレノイドの通電を止め
ると、主バルブ２はリターンスプリング加の働きにより
中立状態に復帰する。When the lowering of the loading platform is completed and the pressure oil in the striking cylinder 1 is depleted, the energization of the solenoid of the pilot valve 4 is stopped, and the main valve 2 returns to the neutral state by the action of the return spring.
次に牙２図の２個の主バルブを用いた場合は、荷台を上
昇作動させるにはパイロットノ（ルプ３を作動させ油圧
ポンプ７の圧油を上昇操作用主パルプ１４の上昇操作用
油圧チャンバ５に圧油を送シ込み上昇操作用主パルプ１
４を作動させ閉回路とし、チェックバルブ１６を出た圧
油は上昇操作用主パルプ１４が閉回路となることよりチ
ェックバルブ１７を経由し打型シリンダ１に流入し打型
シリンダ１を・伸長させ荷台を上昇させる。Next, when using the two main valves shown in Fig. 2, in order to raise the loading platform, operate the pilot valve (loop 3) and apply the pressure oil of the hydraulic pump 7 to the hydraulic pressure for raising the main pulp 14. Main pulp 1 for pumping pressure oil into chamber 5 for lifting operation
4 is actuated to create a closed circuit, and the pressurized oil coming out of the check valve 16 flows into the punching cylinder 1 via the check valve 17 since the main pulp 14 for lifting operation becomes a closed circuit, causing the punching cylinder 1 to elongate. and raise the loading platform.
荷台を下降させる時は、パイロットバルブ３の作動を止
めて上昇操作用主パルプ１４の作動を停止せしめ開回路
とし、パイロットバルブ４を作動させ打型シリンダ１の
圧油を下降操作用油圧チャンバ６に供給することによシ
下降操作用主パルプ１５を開回路とし、打電シリンダ１
〜下降操作用主パルプ１５〜タンク８と逆送せしめる。When lowering the loading platform, the operation of the pilot valve 3 is stopped to stop the operation of the main pulp 14 for lifting operation, creating an open circuit, and the pilot valve 4 is operated to transfer the pressure oil in the punching cylinder 1 to the hydraulic chamber 6 for lowering operation. By supplying the main pulp 15 for lowering the cylinder to an open circuit, the power cylinder 1
〜Main pulp 15 for descending operation〜Tank 8 and reverse feed.
なお、第１図、第２図中１８は各パイロットバルブ３．
４に設けられている手動操作杆で、電気回路が故障した
場合に用いる非常用の手動操作杆である。Note that 18 in FIGS. 1 and 2 indicates each pilot valve 3.
4 is a manual operation lever that is used in case of an electrical circuit failure.
本発明は上述のように、荷台を上昇時においては油圧ポ
ンプ７の油圧によシ上昇させ、荷台を下降させる時は荷
台の重量等によシ発生する打電シリンダ内の内圧により
主バルブを開き圧油をタンクに逆送し荷台の下降を行う
ため下降時には油圧ポンプを作動させる必要がなくなり
、油圧ポンプの寿命延長並びに省エネルギーを図ること
が出来るほか回路自体も簡便であり、従来装置について
改良を加え実施出来る等すぐれた効果を有するものであ
る。As described above, the present invention uses the hydraulic pressure of the hydraulic pump 7 to raise the loading platform when the loading platform is raised, and opens the main valve using the internal pressure in the power cylinder that is generated due to the weight of the loading platform when lowering the loading platform. Pressure oil is sent back to the tank and the platform is lowered, so there is no need to operate the hydraulic pump when lowering, which extends the life of the hydraulic pump and saves energy.The circuit itself is simple, and is an improvement over conventional equipment. In addition, it has excellent effects such as being able to be implemented.
図面社本発明の一実施例を示したもので、オ１図、第３
図は３ボートスプリングセンタ形の切換弁で中立状態を
示した回路図、第２図、第４図は２個のポペットバルブ
を用いた回路図である。
１は打型シリンダ、２は主バルブ、３．３′、４．４′
はパイロットバルブ、５は上昇操作用油圧チャンバ、６
は下降操作用油圧チャンバ、７は油圧ポンプ、８はタン
ク、９．１６．１７はチェックバルブ、１０．１１はチ
ョーク弁、１２はリリーフバルブ、１３はアンロードボ
ート、１４は上昇操作用主バルブ、１５は下降操作用主
バルブ、１８は手動操作杆、１９．２０．２１はリター
ンスプリング。
特許出願人 東急車輛製造株式会社
大１膓
大２図This figure shows one embodiment of the present invention, and Figures 1 and 3
The figure is a circuit diagram showing a neutral state using a three-boat spring center type switching valve, and Figures 2 and 4 are circuit diagrams using two poppet valves. 1 is the striking cylinder, 2 is the main valve, 3.3', 4.4'
is a pilot valve, 5 is a hydraulic chamber for lifting operation, and 6 is a hydraulic chamber for lifting operation.
is a hydraulic chamber for lowering operation, 7 is a hydraulic pump, 8 is a tank, 9.16.17 is a check valve, 10.11 is a choke valve, 12 is a relief valve, 13 is an unloading boat, 14 is a main valve for raising operation. , 15 is the main valve for lowering operation, 18 is a manual operation lever, and 19.20.21 is a return spring. Patent applicant: Tokyu Car Manufacturing Co., Ltd.
Claims (3)
降時は荷台の自重によシ下降する油圧回路において、下
降時に打型シリンダ内に生じる油圧をパイロット圧とし
て作動する主バルブを介し打型シリンダ内の圧油をタン
クに逆送せしめるように構成したことを特徴とする、扛
重装置の油圧操作回路。(1) In the hydraulic circuit, the load on the loading platform is raised by the electric driving cylinder, and when it is lowered, it is lowered by the weight of the loading platform, and when it is lowered, the hydraulic pressure generated in the driving cylinder is used as pilot pressure to operate the driving mold via the main valve. A hydraulic operation circuit for a hoisting device, characterized in that it is configured to send pressure oil in a cylinder back to a tank.
換弁を用い、ダンプ上昇操作時には油圧ボンデ、チェッ
クバルブ、主バルブを介し打電シリンダに接続する回路
を形成し、かつダンプ下降操作時には打電シリンダ、主
バルブ、タンクの回路を形成せしめ、主バルブの上昇操
作用に油圧ポンプの圧油をパイロットバルブを介して３
位置切換弁を作動せしめ、主バルブの下降操作用に打電
シリンダの内圧油をパイロットバルブを介して３位置切
換弁を作動する構成にしたことを特徴とする特許請求の
範囲第１項記載の扛重装置の油圧操作回路。(2) A 3-bottom spring center type 3-position switching valve is used as the main valve, and a circuit is formed that connects to the power supply cylinder via the hydraulic bonder, check valve, and main valve when the dump truck is raised, and when the dump truck is lowered, the circuit is connected to the power supply cylinder. A circuit is formed between the cylinder, main valve, and tank, and pressure oil from the hydraulic pump is supplied to the main valve through the pilot valve.
2. The 3-position switching valve according to claim 1, characterized in that the three-position switching valve is operated, and the internal pressure oil of the power cylinder is used to operate the three-position switching valve via a pilot valve for lowering the main valve. Hydraulic operating circuit for heavy equipment.
上昇操作時には油圧ポンプ、チェックバルブ、常時開型
の主バルブを介し打電シリンダに接続する回路を形成し
、かつダンプ下降時には打電シリンダ、常時閉型の主バ
ルブ、タンクの回路を形成せしめ、主バルブの上昇操作
に油圧ポンプの吐出圧油をパイロットバルブを介して用
い、主バルブの下降操作に打電シリンダの内圧油をパイ
ロットパルプを介して用いる構成にしたことを特徴とす
る特許請求の範囲刀・１項記載の扛重装置の油圧操作回
路。(3) Two poppet valves are used as the main valve to form a circuit that connects to the power cylinder through the hydraulic pump, check valve, and normally open main valve when the dump truck is raised, and the power cylinder is always open when the dump truck is lowered. A closed type main valve and tank circuit is formed, and the pressure oil discharged from the hydraulic pump is used through the pilot valve to raise the main valve, and the internal pressure oil from the electric cylinder is used to lower the main valve through the pilot pulp. A hydraulic operating circuit for a hoisting device according to claim 1, characterized in that it is configured to be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001784A JPS60168903A (en) | 1984-02-08 | 1984-02-08 | Hydraulically operating circuit of weight lifting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001784A JPS60168903A (en) | 1984-02-08 | 1984-02-08 | Hydraulically operating circuit of weight lifting equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60168903A true JPS60168903A (en) | 1985-09-02 |
Family
ID=12015328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001784A Pending JPS60168903A (en) | 1984-02-08 | 1984-02-08 | Hydraulically operating circuit of weight lifting equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60168903A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0351402A1 (en) * | 1987-08-27 | 1990-01-24 | Caterpillar Inc. | Load responsive control system adapted to use of negative load pressure in operation of system controls |
| US5060475A (en) * | 1990-05-29 | 1991-10-29 | Caterpillar Inc. | Pilot control circuit for load sensing hydraulic systems |
| JPH0520931U (en) * | 1991-09-02 | 1993-03-19 | 新明和工業株式会社 | Hydraulic circuit of work vehicle |
| ITMO20080243A1 (en) * | 2008-09-23 | 2010-03-24 | Interpump Hydraulics Spa | DISTRIBUTION DEVICE FOR HYDRAULIC CIRCUITS. |
| CN107131168A (en) * | 2017-05-19 | 2017-09-05 | 青神格林维尔流体动力控制技术有限公司 | A kind of plug-in integrated package of differential cylinder control |
-
1984
- 1984-02-08 JP JP2001784A patent/JPS60168903A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0351402A1 (en) * | 1987-08-27 | 1990-01-24 | Caterpillar Inc. | Load responsive control system adapted to use of negative load pressure in operation of system controls |
| US5060475A (en) * | 1990-05-29 | 1991-10-29 | Caterpillar Inc. | Pilot control circuit for load sensing hydraulic systems |
| WO1991019106A1 (en) * | 1990-05-29 | 1991-12-12 | Caterpillar Inc. | Pilot control circuit for load sensing hydraulic systems |
| JPH0520931U (en) * | 1991-09-02 | 1993-03-19 | 新明和工業株式会社 | Hydraulic circuit of work vehicle |
| ITMO20080243A1 (en) * | 2008-09-23 | 2010-03-24 | Interpump Hydraulics Spa | DISTRIBUTION DEVICE FOR HYDRAULIC CIRCUITS. |
| EP2165878A1 (en) | 2008-09-23 | 2010-03-24 | Interpump Hydraulics S.p.A. | A directional control device for hydraulic circuits |
| CN107131168A (en) * | 2017-05-19 | 2017-09-05 | 青神格林维尔流体动力控制技术有限公司 | A kind of plug-in integrated package of differential cylinder control |
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